needmining: A Simple Needmining Implementation

Showcasing needmining (the semi-automatic extraction of customer needs from
social media data) with Twitter data. It uses the handling of the Twitter API provided by
the package 'rtweet' and the textmining algorithms provided by the package 'tm'.
Niklas Kuehl (2016) <doi:10.1007/978-3-319-32689-4_14> wrote an introduction to the topic of needmining.